Add boilerplate for redux, redux-persist.

reducers/classes.js

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+export default function classes(state) {
+	if (typeof state === "undefined")
+		return [];
+	return state;
+}

reducers/index.js

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+import { combineReducers } from "redux";
+
+import timetable from "./timetable";
+import classes from "./classes";
+
+const rootReducer = combineReducers({
+	timetable,
+	classes
+});
+
+export default rootReducer;

reducers/timetable.js

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+export default function timetable(state) {
+	if (typeof state === "undefined")
+		// Array of days starting with Sunday
+		return [
+			[],
+			[],
+			[],
+			[],
+			[],
+			[],
+			[],
+		];
+	return state;
+}